Fieldbus, Asi-bus, and Profibus technologies are a key part of the interface to systems control and in critical domains. Equipped with sensitive sensors, bus technology becomes the backbone of many processes. In automation technology, bus systems are essential parts of modern applications. Bus technology is used in factories, hospitals and laboratories for the collection of numerous data and enables a more efficient and reliable operation of these complex environments. PHD has the experience working with the important aspects of bus technology and reflecting areas of main activity in science and industry: real-time aspects, networking, management, OPC, system aspects, protocol specifications, validation and research projects.